Electronic device, power source control method, ROF system and its power supplying method and remote unit

Abstract

Electronic devices to which power is supplied from a power supplying unit commonly connected with other electronic devices, each of the electronic devices comprising a switch unit having an input terminal, an output terminal and a control terminal to which a control signal to close between the input terminal and the output terminal, a number input unit to which unique identification information is input, and a timing unit connected to the power supplying device together with the input terminal and inputting the control signal to the control terminal after a lapse of a delay time set in response to the identification information from a start timing of power supplying by the power supplying device.

1. An electronic device to which power can be supplied from a power supply connected with other electronic devices, the electronic device comprising:
 a switch unit having an input terminal, an output terminal and a control terminal which is adapted to receive a control signal to connect a circuit between the input terminal and the output terminal; 
 a number input unit to which unique identification information can be input to set a corresponding delay time; and 
 a timing unit connected to the power supply and arranged to apply the control signal to the control terminal after the set delay time has lapsed after the power supply has been switched on. 
 
   
   
     2. The electronic device according to  claim 1 , wherein
 the set delay time is set a time longer than a peaking time of a rush current which results from turning on the switch unit. 
 
   
   
     3. The electronic device according to  claim 1 , wherein:
 the number input unit comprises a changeover switch arranged to receive the unique identification information input by means of a dial; and 
 the timing unit includes an integration circuit comprising a capacitor and plural resistors of unique resistance values corresponding to the unique identification information and being connected to switching terminals of the changeover switch; and 
 the delay time corresponding to the unique identification information is set according to a particular capacitor-resistor combination. 
 
   
   
     4. The electronic device according to  claim 3 , wherein:
 an input of the integration circuit is connected to the input terminal of the switch unit; and 
 an output of the integration circuit is connected to the control terminal of the switch unit, and the switch unit is arranged to turn on when the output voltage of the control terminal exceeds a prescribed voltage. 
 
   
   
     5. A method of controlling an electronic device according to  claim 1 , the method comprising inputting the unique identification information into the number input unit and switching the power supply on. 
   
   
     6. The method according to  claim 5 , comprising
 setting the delay time to be longer than a peaking time of a rush current which results from turning on the switch unit. 
 
   
   
     7. The method according to  claim 5 , comprising
 inputting the unique identification information by means of a dial and thereby setting the delay time corresponding to the unique identification information as a result of forming an integration circuit comprising a particular capacitor-resistor combination. 
 
   
   
     8. The method according to  claim 7 , wherein an input of the integration circuit is connected to the input terminal of the switch unit, an output of the integration circuit is connected to the control terminal of the switch unit, and the switch unit turns on when the output voltage of the control terminal exceeds a prescribed voltage. 
   
   
     9. A method of controlling a system comprising a power supply connected to a plurality of electronic devices according to  claim 1 , the method comprising
 inputting respective unique identification information into respective number input units of each of the electronic devices, and switching the power supply on. 
 
   
   
     10. The method according to  claim 9 , comprising:
 setting the delay time in each of the electronic devices to be longer than a peaking time of a rush current which results from turning on a respective switch unit in the electronic device. 
 
   
   
     11. The method according to  claim 9 , comprising:
 inputting the unique identification information by means of a dial and thereby setting the delay time corresponding to the unique identification information as a result of forming an integration circuit comprising a particular capacitor-resistor combination. 
 
   
   
     12. The method according to  claim 11 , wherein:
 an input of the integration circuit is connected to the input terminal of the switch unit; 
 an output of the integration circuit is connected to the control terminal of the switch unit; and 
 the switch unit turns on when the output voltage of the control terminal exceeds a prescribed voltage. 
 
   
   
     13. The method according to  claim 9 , wherein the system comprises a Radio over Fiber (ROF) system. 
   
   
     14. A system comprising a power supply connected to a plurality of remote units, each of the remote units comprising:
 a switch unit having an input terminal, an output terminal and a control terminal which is adapted to receive a control signal to connect a circuit between the input terminal and the output terminal; 
 a number input unit to which unique identification information can be input and which sets a corresponding delay time; and 
 a timing unit connected to the power supply and arranged to apply the control signal to the control terminal after the set delay time has lapsed after the power supply has been switched on. 
 
   
   
     15. The system according to  claim 14 , wherein the system comprises a Radio over Fiber (ROF) system.